You'll need a recent version of Rust (1.70+) and the Sollya
tool. On macOS, you can install the latter via Homebrew with
brew install sollya. On Ubuntu or Debian, use apt install sollya.
Finally, clone the repository and build with cargo build.
Optionally, you can register the compiler as an external stage for the
Calyx driver, fud. After installing fud, register the compiler with
fud register -p <absolute path to calyx-nums repository>/fud/stage.py calyx-nums